[ITAL] Network Protocol

[ITAL] Network Protocol - 1

Objectives

• describe what a protocol is and different types of protocols (including: Wide Area Network protocols and Local Area Network access protocols)

Open Ended

What is Communication Protocol?

Communication Protocol

• Set of rules that ensure data is transferred between devices correctly

• Important so that different devices, platforms can communicate with each other

What could protocols defined?

• Method of addressing

• Type of error checking

• How to indicate start and end of message

• How receiver confirms the message

• Compression methods

OSI layers

Note those protocols in the OSI

Datalink layer

• Ethernet Protocol

• Transmitting Dataframes within LAN

• Use Physical Address (MAC address) for addressing

• Additional protocol: PPP

Multiple Select

Which of the followings about MAC address is true:

• Physical address (ID) of device

• Physical location of device

• Contains information about vendor of the device

• It's a Data link Layer address

• None of the rest

Network Layer

• IP - Internet Protocol

• Defines IP Address

• IP deals with data packets, and routing of data packets to destination

• Router is a network layer device

Open Ended

Give one example IP Address

Public vs Local IP address

There's not enough public IPv4 addresses for every devices that connected to Internet.

The solution is to have local IP address that works locally.

Address that starts with 10, 172 or 192 are examples of local IP address.

Transport Layer

• TCP is an example transport layer protocol

• UDP is another transport layer protocol

• Watch video and answer:

• https://youtu.be/AYdF7b3nMto

Multiple Choice

Type of switching did data transmit in Internet

• Circuit

• Packet

• Message

Multiple Select

The role of TCP

• Make sure message is transmitted to receiver

• Breaking message in data packets

• Checking if all packets are received

• Assemble all data packets in the correct order

• Routing of data packets

Application Layer

• Application layer protocols built on-top of TCP

• Some common Protocols:

• HTTP, HTTP/S: Web server communicate with client (e.g. Browser)

• IMAP, POP3, SMTP: Email protocols

• FTP: File Transfer Protocol

• DNS: Resolving (translate) web domain name to IP addresses

Open Ended

Exit question:

Why is protocol important? Give one example of Application, Transport, and Data link layer protocol.